I developed two new CCD camera drivers based on the Generic CCD example and got both of them working fine with the version of KStars and Ekos that I downloaded in November (2019). I just updated KStars to version 3.3.9 and now my drivers no longer work. I am using Ubuntu 18.04.3 (Ubuntu Mate) on a Raspberry Pi 3B+. The drivers show up in the selection list, but will no longer Connect & Disconnect. They can also be started with INDI Server and all indications are that they are working fine, but applications like PHD2 cannot connect to the cameras. I have created a persistent USB name for each of these and can verify that the name is listed in /dev/. Any suggestions would be appreciated.

Also, related - I could not find how to back up to a previous version of KStars. Are the older versions for Ubuntu located somewhere that I can access them and verify that my problem is from loading the new version only?